package com.mymall.service.Impl;

import com.mymall.common.Const;
import com.mymall.common.ServerResponse;
import com.mymall.common.TokenCache;
import com.mymall.dao.UserMapper;
import com.mymall.pojo.User;
import com.mymall.service.IUserService;
import com.mymall.utils.MD5Util;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.UUID;

/**
 * Created by Chengxiang on 2018/8/30.
 */
@Service("iUserService")
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserMapper userMapper;

    /**
     * 登陆验证
     * @param username
     * @param password
     * @return
     */
    @Override
    public ServerResponse<User> login(String username, String password) {
        int resultCount = userMapper.checkUsername(username);
        if (resultCount == 0) {
            return ServerResponse.createByErrorMessage("用户不存在");
        }

        String md5Password = MD5Util.MD5EncodeUtf8(password);
        User user = userMapper.selectLogin(username, md5Password);
        if (user == null) {
            return ServerResponse.createByErrorMessage("密码错误");
        }

        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess("登录成功", user);
    }

    @Override
    public ServerResponse<String> register(User user) {
        ServerResponse validResponse = this.checkValid(user.getUsername(), Const.USERNAME);
        if (!validResponse.isSuccess()) {
            return validResponse;
        }
        validResponse = this.checkValid(user.getEmail(), Const.EMAIL);
        if (!validResponse.isSuccess()) {
            return validResponse;
        }

        user.setRole(Const.Role.ROLE_CUTOMER);
        //MD5加密
        user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));

        int resultCount = userMapper.insert(user);
        if (resultCount == 0) {
            return ServerResponse.createByErrorMessage("注册失败");
        }
        return ServerResponse.createBySuccess("注册成功");
    }

    /**
     * @param str
     * @param type
     * @return
     */
    @Override
    public ServerResponse<String> checkValid(String str, String type) {
        if (StringUtils.isNotBlank(type)) {
            //开始校验
            if (Const.USERNAME.equals(type)) {
                int resultCount = userMapper.checkUsername(str);
                if (resultCount > 0) {
                    return ServerResponse.createByErrorMessage("用户已存在");
                }
            }
            if (Const.EMAIL.equals(type)) {
                int resultCount = userMapper.checkEmail(str);
                if (resultCount > 0) {
                    return ServerResponse.createByErrorMessage("email已存在");
                }
            }
        } else {
            return ServerResponse.createByErrorMessage("参数错误");
        }
        return ServerResponse.createBySuccess("校验成功");
    }

    @Override
    public ServerResponse selectQuestion(String username) {
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if (!validResponse.isSuccess()) {
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        String question = userMapper.selectQuestionByUserName(username);
        if (StringUtils.isNotBlank(question)) {
            return ServerResponse.createBySuccess(question);
        }

        return ServerResponse.createByErrorMessage("找回密码的问题是空的");
    }

    @Override
    public ServerResponse<String> checkAnswer(String username, String question, String answer) {
        int resultCount = userMapper.checkAnswer(username, question, answer);
        if (resultCount > 0) {
            //问题回答正确
            String forgetToken = UUID.randomUUID().toString();
            TokenCache.setKey(TokenCache.TOKEN_PREFIX + username, forgetToken);
            return ServerResponse.createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题答案错误");
    }

    @Override
    public ServerResponse<String> forgetResetPassword(String username, String passwordNew, String forgetToken) {
        if (StringUtils.isBlank(forgetToken)) {
            return ServerResponse.createByErrorMessage("参数错误，token不能为空");
        }
        ServerResponse validResponse = this.checkValid(username, Const.USERNAME);
        if (!validResponse.isSuccess()) {
            return ServerResponse.createByErrorMessage("用户不存在");
        }

        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX + username);
        if (StringUtils.isBlank(token)){
            return ServerResponse.createByErrorMessage("token无效或者过期");
        }

        if(StringUtils.equals(forgetToken,token)){
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            int rowCount = userMapper.updatePasswordByUsername(username,md5Password);

            if (rowCount >0){
                return ServerResponse.createBySuccess("修改密码成功");
            }
        }else {
            return ServerResponse.createByErrorMessage("token错误，请重新获取重置密码的token");
        }
        return ServerResponse.createByErrorMessage("修改密码失败");
    }

    @Override
    public ServerResponse<String> resetPassword(String passwordOld, String passwordNew, User user) {
        //防止横向越权，要检验一下这个用户的旧密码,一定要指定这个用户
        int resultCount = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld), user.getId());
        if (resultCount == 0) {
            return ServerResponse.createByErrorMessage("invalid password");
        }

        user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
        int updateCount = userMapper.updateByPrimaryKeySelective(user);
        if (updateCount>0){
            return ServerResponse.createBySuccess("更新密码成功");
        }
        return ServerResponse.createByErrorMessage("更新密码失败");
    }

    @Override
    public ServerResponse<User> updateInfomation(User user){
        //username是不能被更新的
        //email也要进行一个校验，校验新的email是不是已经存在，并且存在的email如果相同的话，不能是我们当前的这个用户的。
        int resultCount = userMapper.chechEmailByUserId(user.getEmail(),user.getId());
        if (resultCount >0 ){
            return ServerResponse.createByErrorMessage("email已存在");
        }
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());

        int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);
        if (updateCount > 0){
            return ServerResponse.createBySuccess("更新个人信息成功", updateUser);
        }
        return ServerResponse.createByErrorMessage("更新个人信息失败");
    }

    @Override
    public ServerResponse<User> getInfomation(Integer userId){
        User user = userMapper.selectByPrimaryKey(userId);
        if (user == null){
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }

    //backend
    @Override
    public ServerResponse checkAdminRole(User user){
        if(user != null && user.getRole().intValue() == Const.Role.ROLE_ADMIN){
            return ServerResponse.createBySuccess();
        }
        return ServerResponse.createByError();
    }
}
